Polyester film for release film
AssigneeMitsubishi Polyester Film GmbH
InventorHiroteru Okumura
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Abstract
The present invention relates to a polyester film for release film, which has a maximum height of projection (Rmax) in one surface (surface A) of said polyester film, of not more than 500 nm; and has a thickness variation defined by the following equation using the maximum, minimum and mean values of film thickness in the machine and transverse directions of said polyester film, of not more than 5%: Thickness variation (%)=(maximum thickness−minimum thickness)×100/average thickness
Claims13
A polyester film for release film, which has a maximum height of projection (Rmax) in one surface (surface A) of said polyester film, of not more than 500 nm;
- and has a thickness variation defined by the following equation using the maximum, minimum and mean values of film thickness in the machine and transverse directions of said polyester film, of not more than 5%:
- Thickness variation (%)=(maximum thickness−minimum thickness)×100/average thickness
A release film comprising a polyester film and a release layer provided on one surface (surface A) of said polyester film, in which a maximum height of projection (Rmax) in the surface A of said polyester film is not more than 500 nm, and thickness variation defined by the following equation using the maximum, minimum and mean values of the film thickness in the machine and transverse directions of said polyester film is not more than 5%:
- Thickness variation (%)=(maximum thickness−minimum thickness)×100/average thickness
Dependencies are inferred from the claim text.